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-rw-r--r--tran/slope.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/tran/slope.c b/tran/slope.c
new file mode 100644
index 0000000..2ed5846
--- /dev/null
+++ b/tran/slope.c
@@ -0,0 +1,210 @@
+#include "stdio.h"
+#ifndef mips
+#include "stdlib.h"
+#endif
+#include "xlisp.h"
+#include "sound.h"
+
+#include "falloc.h"
+#include "cext.h"
+#include "slope.h"
+
+void slope_free();
+
+
+typedef struct slope_susp_struct {
+ snd_susp_node susp;
+ long terminate_cnt;
+ boolean logically_stopped;
+ sound_type input;
+ long input_cnt;
+ sample_block_values_type input_ptr;
+
+ sample_type prev;
+ double scale;
+} slope_susp_node, *slope_susp_type;
+
+
+void slope_n_fetch(register slope_susp_type susp, snd_list_type snd_list)
+{
+ int cnt = 0; /* how many samples computed */
+ int togo;
+ int n;
+ sample_block_type out;
+ register sample_block_values_type out_ptr;
+
+ register sample_block_values_type out_ptr_reg;
+
+ register sample_type prev_reg;
+ register double scale_reg;
+ register sample_block_values_type input_ptr_reg;
+ falloc_sample_block(out, "slope_n_fetch");
+ out_ptr = out->samples;
+ snd_list->block = out;
+
+ while (cnt < max_sample_block_len) { /* outer loop */
+ /* first compute how many samples to generate in inner loop: */
+ /* don't overflow the output sample block: */
+ togo = max_sample_block_len - cnt;
+
+ /* don't run past the input input sample block: */
+ susp_check_term_log_samples(input, input_ptr, input_cnt);
+ togo = min(togo, susp->input_cnt);
+
+ /* don't run past terminate time */
+ if (susp->terminate_cnt != UNKNOWN &&
+ susp->terminate_cnt <= susp->susp.current + cnt + togo) {
+ togo = susp->terminate_cnt - (susp->susp.current + cnt);
+ if (togo == 0) break;
+ }
+
+
+ /* don't run past logical stop time */
+ if (!susp->logically_stopped && susp->susp.log_stop_cnt != UNKNOWN) {
+ int to_stop = susp->susp.log_stop_cnt - (susp->susp.current + cnt);
+ /* break if to_stop == 0 (we're at the logical stop)
+ * AND cnt > 0 (we're not at the beginning of the
+ * output block).
+ */
+ if (to_stop < togo) {
+ if (to_stop == 0) {
+ if (cnt) {
+ togo = 0;
+ break;
+ } else /* keep togo as is: since cnt == 0, we
+ * can set the logical stop flag on this
+ * output block
+ */
+ susp->logically_stopped = true;
+ } else /* limit togo so we can start a new
+ * block at the LST
+ */
+ togo = to_stop;
+ }
+ }
+
+ n = togo;
+ prev_reg = susp->prev;
+ scale_reg = susp->scale;
+ input_ptr_reg = susp->input_ptr;
+ out_ptr_reg = out_ptr;
+ if (n) do { /* the inner sample computation loop */
+{ register sample_type x = *input_ptr_reg++;
+*out_ptr_reg++ = (sample_type) ((x - prev_reg) * scale_reg);
+prev_reg = x;};
+ } while (--n); /* inner loop */
+
+ susp->prev = prev_reg;
+ /* using input_ptr_reg is a bad idea on RS/6000: */
+ susp->input_ptr += togo;
+ out_ptr += togo;
+ susp_took(input_cnt, togo);
+ cnt += togo;
+ } /* outer loop */
+
+ /* test for termination */
+ if (togo == 0 && cnt == 0) {
+ snd_list_terminate(snd_list);
+ } else {
+ snd_list->block_len = cnt;
+ susp->susp.current += cnt;
+ }
+ /* test for logical stop */
+ if (susp->logically_stopped) {
+ snd_list->logically_stopped = true;
+ } else if (susp->susp.log_stop_cnt == susp->susp.current) {
+ susp->logically_stopped = true;
+ }
+} /* slope_n_fetch */
+
+
+void slope_toss_fetch(susp, snd_list)
+ register slope_susp_type susp;
+ snd_list_type snd_list;
+{
+ long final_count = susp->susp.toss_cnt;
+ time_type final_time = susp->susp.t0;
+ long n;
+
+ /* fetch samples from input up to final_time for this block of zeros */
+ while ((round((final_time - susp->input->t0) * susp->input->sr)) >=
+ susp->input->current)
+ susp_get_samples(input, input_ptr, input_cnt);
+ /* convert to normal processing when we hit final_count */
+ /* we want each signal positioned at final_time */
+ n = round((final_time - susp->input->t0) * susp->input->sr -
+ (susp->input->current - susp->input_cnt));
+ susp->input_ptr += n;
+ susp_took(input_cnt, n);
+ susp->susp.fetch = susp->susp.keep_fetch;
+ (*(susp->susp.fetch))(susp, snd_list);
+}
+
+
+void slope_mark(slope_susp_type susp)
+{
+ sound_xlmark(susp->input);
+}
+
+
+void slope_free(slope_susp_type susp)
+{
+ sound_unref(susp->input);
+ ffree_generic(susp, sizeof(slope_susp_node), "slope_free");
+}
+
+
+void slope_print_tree(slope_susp_type susp, int n)
+{
+ indent(n);
+ stdputstr("input:");
+ sound_print_tree_1(susp->input, n);
+}
+
+
+sound_type snd_make_slope(sound_type input)
+{
+ register slope_susp_type susp;
+ rate_type sr = input->sr;
+ time_type t0 = input->t0;
+ int interp_desc = 0;
+ sample_type scale_factor = 1.0F;
+ time_type t0_min = t0;
+ falloc_generic(susp, slope_susp_node, "snd_make_slope");
+ susp->prev = 0.0F;
+ susp->scale = input->sr * input->scale;
+ susp->susp.fetch = slope_n_fetch;
+ susp->terminate_cnt = UNKNOWN;
+ /* handle unequal start times, if any */
+ if (t0 < input->t0) sound_prepend_zeros(input, t0);
+ /* minimum start time over all inputs: */
+ t0_min = min(input->t0, t0);
+ /* how many samples to toss before t0: */
+ /* Toss an extra 1 samples to make up for internal buffering: */
+ susp->susp.toss_cnt = (long) ((t0 - t0_min) * sr + 1.5);
+ if (susp->susp.toss_cnt > 0) {
+ susp->susp.keep_fetch = susp->susp.fetch;
+ susp->susp.fetch = slope_toss_fetch;
+ }
+
+ /* initialize susp state */
+ susp->susp.free = slope_free;
+ susp->susp.sr = sr;
+ susp->susp.t0 = t0;
+ susp->susp.mark = slope_mark;
+ susp->susp.print_tree = slope_print_tree;
+ susp->susp.name = "slope";
+ susp->logically_stopped = false;
+ susp->susp.log_stop_cnt = logical_stop_cnt_cvt(input);
+ susp->susp.current = 0;
+ susp->input = input;
+ susp->input_cnt = 0;
+ return sound_create((snd_susp_type)susp, t0, sr, scale_factor);
+}
+
+
+sound_type snd_slope(sound_type input)
+{
+ sound_type input_copy = sound_copy(input);
+ return snd_make_slope(input_copy);
+}